Table 1.

Tissue fractions and fit error (%) of the fitted GABA+ model (mean ± SD) of the left (dominant) and right (non-dominant) SMC voxels for both young and older adults. Significant p-values (group comparison) are printed in bold. A parametric unpaired t-test was used when the data of each group were normally distributed, whereas a non-parametric Wilcoxon Rank Sum test was used when the respective normality assumption was not met.

	DOMINANT (LEFT) SMC			NON-DOMINANT (RIGHT) SMC
	YOUNG	OLDER	p-value	YOUNG	OLDER	p-value
GREY MATTER	0.337 ± 0.028	0.256 ± 0.030	<0.001	0.356 ± 0.032	0.268 ± 0.031	<0.001
WHITE MATTER	0.603 ± 0.036	0.625 ± 0.041	0.022	0.572 ± 0.034	0.600 ± 0.039	0.010
CEREBROSPINAL FLUID	0.060 ± 0.016	0.119 ± 0.034	<0.001	0.072 ± 0.019	0.131 ± 0.031	<0.001
FIT ERROR (%)	4.146 ± 0.764	4.470 ± 1.393	0.901	4.437 ± 1.316	4.732 ± 1.299	0.392